The classic v belts are the most common and economical v belt used in the power transmission industry. Nominal dimensions of the four cross sections are given in table 1. Due to the single belt design, uniform tension is put on the belt across all grooves. Other features of the polyv drive systems include being able to transmit up to 600kw with just one belt. The outside of the poly v belt is flat and has several vshaped grooves along the inside. Gates vbelt cross reference gates belt conversion charts.
Replace vbelts with cogged or synchronous belt drives. The number following it is the outside length of the belt in tenths of inches. Service factors for different kinds of driven machines combined with different types of driving units are shown in table. Mptab7i2007r 20 calculation of vbelt tensions and shaft loads mechanical power transmission association 5672 strand court, suite 2, naples, fl 34110. Basics of belt drives power transmission belting has been used for more than 200 years. Fhp vbelts are measured on the outside diameter example 4l40040od. Pdf in its simplest form a drive of this type consists of an endless belt fitted tightly over two pulleys driving and driven transmitting motion. Ups deliveries do not include saturday or sunday, unless specified in shipping method.
Rubber vee belt technical specification b c spb spc. Com i r 1 2 3 4 5 6 7 8 9 10 11 12 t 14 15 a timing belts, pulleys, chains and sprockets handbook of. They are easy to install and remove, resistant to oil and heat, and require little maintenance. Standard vbelts are a common choice to power equipment in a range of. The inside length of the belt is typically 2 less for a 4l belt, and 112 less for a 3l belt. With either type of sheave, always make sure that the mating surfaces of the sheave and hub. Vbelt drives can have a peak efficiency of 95% to 98% at the time of installation. Place the tension checker squarely on one belt at the center of the belt span. Later, cotton or hemp rope was used with vgroove pulleys to reduce belt tension.
The v belt consists of steel wires, base rubber compound, and protective cover. Together these devices offer a highspeed power transmission solution that is resistant to slipping and misalignment. V belt drive advantages efficiency tests of carlisle multiple v belt drives have shown them to be 94 98% efficient. The design is best suited for small sheaves and can be operated at high. Adhere to the following procedure when changing or installing a v belt drive, regardless of the application. There are 3 common belt designs in mechanical maintenance. The v shape allows the belt to fit securely in the pulley to prevent side drift and. Step 2 determine if the vbelt is wrapped or notched style if the belt you have is notched add an x to the type. Vbelt orders placed before 1pm cst, mf on or by phone are normally shipped within 24 hrs.
They transfer force from motors to pulleys to power a variety of parts including paddles, rollers, water pumps, compressors, and fans. Worn sheaves can seriously shorten the life of vbelts, especially the joined, polyband form. An overloaded belt drive is like a oneton truck with a twoton load both are sure to break down. The classic a belt is the most tried and true style of vbelt in the market. Step 2 determine if the v belt is wrapped or notched style if the belt you have is notched add an x to the type. First, to determine what type of belt is on your fan, measure the width of the belt. These are used in many industries such as industrial, agricultural, material handling, hvac and much more. Simple guide for measuring vbelts the poultry site. Vbelts work optimally when the angled sides of the belt are making constant contact with the pulleys they are spinning.
Vbelt cross reference vbelt cross reference chart pdf. If the drive being calculated is of the vflat type one v pulley and one flat. Classic a section vbelts are exactly that, classic in design and application. Dimensions of vbelts and pulleys together with basic design data are covered in this manual. Vbelts power transmission belts grainger industrial. The article describes on the constructional aspects of vbelts, the types of v belts and their advantages and disadvantages.
The mechanical belt drive, using a pulley machine, was first mentioned in the text the dictionary of local expressions by the han dynasty philosopher, poet, and politician yang xiong 5318 bc in 15 bc, used for a quilling machine that wound silk fibers on to bobbins for weavers shuttles. Vbelts, sometimes called veebelts, are a type of drive belt that have tapered sides that fit in pulleys with side guides. Industrial v belts vbelt construction, types, by size. The suregrip tapered, qdtype interchangeable bushing offers flexible and easy installation. How can i identify the correct vbelt type when the belt. If you peek under the hood and notice that the vbelts are not running along the top of the pulleys as normal, or if you notice theyre getting cracked or otherwise looking worn, its probably time for a replacement. The selection of a v belt drive for any application should be based on the nature of the load and the type of driving unit. A sheave that is too small for the belt type can cause damage to the bottom of the belt. Solution based on power input possible belt type is a or b assumption belt type a, minimum sheave 75mm.
Adhere to the following procedure when changing or installing a vbelt drive, regardless of the application. An example would be 4l460, which would be 46 long outside, 44 inside. If the drive being calculated is of the vflat type one v pulley and one flat pulley it is. How to read vbelt numbers automotive belts start with either 4l 12. This manual does not apply to automotive and agricultural drives. In a wellengineered v belt, the tensile cords and rubber body of the belt are chemically bonded to form one unit, allowing for equal load distribution and longer belt life. V belts basic characteristics and selection youtube.
The belt drive is an essential component to the invention of the spinning wheel. Joined or multiple belts are specified for heavy loads. The number one cause of a power transmission belt failure is improper. Scope this standard covers two sheave locked center drives using classical and narrow industrial vbelts and sheaves covered under arpm ip20, ip22, and ip23.
Shafts must be parallel and sheave grooves in alignment to prevent unnecessary belt wear. V belt dimensions v belt specifications v belt information. In effect, this v belt configuration combines the function of the flat belt and the v belt. Scope this standard covers two sheave locked center drives using classical and narrow industrial v belts and sheaves covered under arpm ip20, ip22, and ip23. Apply a force on the plunger and perpendicular to the belt span until the bottom of the large oring is even with the top of the adjacent next belt or with the bottom of a straight edge laid across the outside diameters of the vbelt sheaves. You can also use our browning belt rule that includes a gauge to help easily identify belt type. What makes a vbelt pulley stand out from other types of pulleys, such as a round belt or flat pulley, are the vshaped grooves of the pulley. Standard vbelts are single vbelts that fit in singlegroove pulleys. Ensure even load distribution on drives with multiple belts. The article describes on the constructional aspects of v belts, the types of v belts and their advantages and disadvantages.
For instance, a vbelt with size 100 coded 50 is exactly 100 inches inside length. Velts ax, x, x type v elts medium and high horsepower applications for industrial single or multiple velt drives ogged construction allows belt to flex around drive sheave and run cooler than the no cogged standard velt design. These highly capable belts are adapted for a wide range of uses with exceptional, highquality constructions. Ground form edges reduce center distance variation and drive. Fractional horsepower dry fabric wrapped vbelts with kevlar cord 3l4l5l dry fabric wrapped fhp vbelts with kevlar cord are designed for use on most outdoor power equipment and agricultural equipment including lawnmowersgarden tractors snowblowers and tillers. Apply a force on the plunger and perpendicular to the belt span until the bottom of the large o ring is even with the top of the adjacent next belt or with the bottom of a straight edge laid across the outside diameters of the vbelt sheaves. The trapezoidal shape allows these belts to wedge into pulleys in the presence of misalignment. Most fan belts are a type belts with a measurement of 12 if the fan belt measures 58. Always maintain proper tension through motor adjustment. Vbelts drives types, characteristic and industrial. Vbelt pulleys this fastening is generally sufficient to transmit the power.
Because of the wide variety of belt sizes available, almost any type of drive application can be. They can also be used sidebyside in wide belt drives that are designed for multiple single belts. Vbelt pulleys also called vee belt sheaves are devices which transmit power between axles by the use of a vbelt, a mechanical linkage with a trapezoidal crosssection. Do you know the best ways to troubleshoot and maintain v. A narrow belt profile transmits up to three times the horsepower of standard vbelts for use on heavy duty drives with shock loads. One poly v belt has as much traction power as several traditional vbelts working together. The motor size limits the center distance to at least 550 mm. The carlisle vbelt drive service manualhas been prepared with the double purpose of.
Industrial vbelt drives service manual drive engineer. Tensile cords are supported by rubber stocks, both above over cord and beneath under cord. In its simplest form a drive of this type consists of an endless belt fitted tightly over two pulleys driving and driven transmitting motion from the driving to the receiving pulley by. Solution based on power input possible belt type is a or b assumption belt type a, minimum sheave. The question of matched sets arises in case of multi vbelt drive as the length of vbelt should be matched in order to obtain even distribution of load. Nominal dimensions of vbelt cross sections in mm classical vbelts 01 cross section w h. A vbelts purpose is to transmit energy between two components. This is the best practice, as prescribed by skf ptp. Vbelts use a trapezoidal cross section to create a wedging action on the pulleys to increase friction and the belts power transfer capability.
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